Hi~ powertop can download from http://www.lesswatts.org/projects/powertop/download/powertop-1.11.tar.gz Sorry~I forgot the name of Intel utility. Best Regards, Edward On Sun, Jun 21, 2009 at 6:02 PM, Mahmood Naderan<mahmood.nt@xxxxxxxxx> wrote: > Hi, > 1- where can I find powertop source code? > 2- what is the name of intel utility in windows as you said? > -------------------------- > *Mahmood Naderan* > > > > > On Sun, Jun 21, 2009 at 2:19 PM, Edward Shao<laface.tw@xxxxxxxxx> wrote: >> Hi~ >> It's all depended on how utility to interpret raw information (both >> information reported by CPU or BIOS). >> You can check source code of powertop for detail information. >> For BIOS part, powertop checks value of mwait hint register reported >> by ACPI _CST method. >> >> As my experience, powertop will cause a misleading sometimes, >> especially for new Intel CPU. >> For example: >> BIOS engineer said they followed Intel BIOS porting guide to report an >> accuracy C-state (C6) information via ACPI _CST method. >> However powertop said BIOS only reports C3. (but Intel utility under >> Windows said CPU can enter C6). >> >> Best Regards, >> Edward >> >> On Sat, Jun 20, 2009 at 2:54 PM, Mahmood Naderan<mahmood.nt@xxxxxxxxx> wrote: >>> Hi, >>>> Only simple check value of edx. >>>> Well, unless CPU uses CPUID.5.EDX[31:20], the reserved area. >>> >>> You mean that powertop is not correctly reading the states? Do you >>> mean that the BIOS reports better that the CPU ? >>> >>> -------------------------- >>> *Mahmood Naderan* >>> >>> >>> >>> On Sat, Jun 20, 2009 at 7:26 AM, Edward Shao <laface.tw@xxxxxxxxx> wrote: >>>> >>>> Hi Mahmood, >>>> >>>> So far as I know, if your CPU is Intel, powertop maybe cause a misleading. >>>> Powertop uses CPUID.5.EDX to check CPU supported C states. >>>> According Intel's spec (Intel Processor Identification and the CPUID >>>> Instruction (Application Note 485), a CPU only has >>>> >>>> C0, C1, C2, C3, C4 (prior Core i7) >>>> C0, C1, C2, C6, C7 (Core i7 and subsequent) >>>> >>>> Check with source code of powertop >>>> while (edx) { >>>> if (edx&7) >>>> printf("C%i ", i); >>>> edx = edx >> 4; >>>> i++; >>>> } >>>> Only simple check value of edx. >>>> Well, unless CPU uses CPUID.5.EDX[31:20], the reserved area. >>>> >>>> Ps: I does not check AMD's spec. >>>> >>>> Best Regards, >>>> Edward >>>> >>>> >>>> On Sat, Jun 20, 2009 at 1:07 AM, Mahmood Naderan<mahmood.nt@xxxxxxxxx> wrote: >>>> > Hi, >>>> > I have run powertop with root permission with both AC and batter powers. The >>>> > reported C_States are the same and strange: >>>> > >>>> > mahmood@magma:~$ sudo powertop >>>> > PowerTOP 1.11 (C) 2007, 2008 Intel Corporation >>>> > >>>> > Collecting data for 5 seconds >>>> > >>>> > Your CPU supports the following C-states : C1 C2 C3 C4 C5 C6 >>>> > Your BIOS reports the following C-states : C1 C2 C6 >>>> > >>>> > Where are C4 and C5? >>>> > >>>> > -------------------------- >>>> > *Mahmood Naderan* >>>> > -- >>>> > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in >>>> > the body of a message to majordomo@xxxxxxxxxxxxxxx >>>> > More majordomo info at http://vger.kernel.org/majordomo-info.html >>>> > >>>> >>>> >>>> >>>> -- >>>> Best Regards, >>>> Edward >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >> >> >> >> -- >> Best Regards, >> Edward >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Best Regards, Edward -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
